title: S1 and S2 states of linear and zigzag cata-condensed hydrocarbons.
abstract: We investigated the S1 and S2 states of linear and zigzag cata-condensed hydrocarbons on the basis of the results of jet spectroscopy and theoretical calculations. The S1 states of anthracene and tetracene are represented by the HOMO → LUMO configuration (Φ(A)), whereas those of phenanthrene and chrysene are represented by HOMO-1 → LUMO and HOMO → LUMO+1 configurations (Φ(B)). We found that the fluorescence lifetime varied with different vibronic levels in the S1 states of linear cata-condensed hydrocarbons due to the mode-selective internal conversion to the S0 state. This selectivity is likely to be seen in the S1 Φ(A) state of the D(2h) molecule.
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University , Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Baba
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Katori
authors.forename: Megumi
authors.initials: M
authors.lastname: Kawabata
authors.forename: Sachi
authors.initials: S
authors.lastname: Kunishige
authors.forename: Takaya
authors.initials: T
authors.lastname: Yamanaka